CN105174648A - Processing method of high-concentration high-salinity wastewater - Google Patents
Processing method of high-concentration high-salinity wastewater Download PDFInfo
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- CN105174648A CN105174648A CN201510668621.1A CN201510668621A CN105174648A CN 105174648 A CN105174648 A CN 105174648A CN 201510668621 A CN201510668621 A CN 201510668621A CN 105174648 A CN105174648 A CN 105174648A
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Abstract
A processing method of high-concentration high-salinity wastewater comprises the following steps: step A, filtering; step B, adjusting a pH value; step C, evaporating and condensing; step D, adding clay into condensed wastewater and combining the wastewater with the clay to form particles; step E, calcinating the particles formed in step D to dehydrate salinity in the particles and form slag with produced inorganic matter, and landfilling the slag; step F, burning gas produced by calcination in step E for a second time, and performing waste gas treatment on smoke generated by the secondary burning and then emitting to the atmospheric environment. The procedures such as particle preparing, calcinating and secondary burning are adopted so as to effectively remove the salinity and organic matter in the wastewater and meet emission requirements; meanwhile, device requirements are low, and a wastewater processing technique is simplified, and the stability and continuity of the wastewater processing technique are improved.
Description
Technical field
The present invention relates to technical field of waste water processing, be specifically related to a kind for the treatment of process of high density high-salt wastewater.
Background technology
The waste water saltiness produced in the fine chemistry industry production processes such as dyestuff, agricultural chemicals, pharmacy and daily-use chemical industry be 3 ~ 10%(in mass), COD is within the scope of 50000 ~ 150000mg/L, in industry, this kind of waste water is referred to as high density high-salt wastewater, it is the extremely unmanageable waste water of one; Different according to production process, in waste water, contained organic kind and chemical property differ greatly, and its composition mostly is benzene series organism and heterogeneous ring compound, biodegradability extreme difference.Meanwhile, containing salts substances such as Cl-, SO42-, Na+, Ca2+ in waste water, and very high concentrations.Although these ions are all the necessary nutritive elements of microorganism growth, in microbial growth process, play promotion enzyme reaction, maintain the vital role of membrane equilibrium and adjustment osmotic pressure.If these ionic concns are too high, can produce microorganism and suppress and toxic action, main manifestations: chlorion is high to the toxic effect of bacterium.
Therefore high density high-salt wastewater governing problem is the bottleneck of enterprise development always, mostly traditional method of wastewater treatment is by modes such as multiple times of filtration, precipitation, neutralizations, objectionable impurities in removing waste water, but, need high density high-salt wastewater to be processed into meet emission request, its technology difficulty is higher, and the effect of wastewater treatment is not ideal enough, as can not links accurately in Controlling Technology flow process, be even difficult to the requirement reaching discharge.
Summary of the invention
For the deficiencies in the prior art, object of the present invention aims to provide a kind for the treatment of process of high density high-salt wastewater, and it under the prerequisite meeting emission request, can simplify waste water treatment process.
For achieving the above object, the present invention adopts following technical scheme:
A treatment process for high density high-salt wastewater, comprises the following steps of sequentially carrying out:
Steps A, utilize filtration unit to filter high density high-salt wastewater, remove the suspended substance in waste water;
Step B, in filtered waste water, add acid and/or alkali, the pH value of waste water is adjusted to 6.0-7.0;
Step C, evaporation concentration is carried out to the waste water that have adjusted pH value, improve salt and organic concentration in waste water;
Add inert material in step D, waste water after concentration, waste water is combined with clay and makes particle;
Step e, the particle that step D makes to be calcined, make the salinity in particle and the dehydration of other inorganicss form slag, landfill is carried out to slag;
Step F, to step e calcining produce gas carry out secondary combustion, secondary combustion produce flue gas carry out off gas treatment after be disposed to atmospheric environment.
In step C, the mass percentage concentration of salt in waste water is brought up to more than 20%, COD concentration brings up to more than 100000mg/L.
In step e, particle is sent into kiln calcining, calcining temperature is not less than 700 DEG C.
In step F, gas step e produced sends into dual firing chamber's burning, and the temperature of combustion of dual firing chamber controls within the scope of 900 ~ 1100 DEG C.
In step F, the flue gas that secondary combustion produces was sent to heat exchanger before carrying out off gas treatment, flue gas with the refrigerant heat exchange of heat exchanger after the heat that produces for the particle before calcining in step e and and the air of particle burning carry out preheating.
The water of condensation concentrating generation in step C also needs to carry out biochemical treatment system successively, advanced treatment system carries out processing rear discharge or reuse.
Inert material is clay or kaolin or diatomite.
Beneficial effect of the present invention is:
Compared to prior art, aforesaid method of the present invention prepares the operations such as particle, calcining, secondary combustion owing to adopting, can by the salinity in waste water with solid-state isolated in form out, and be separated comparatively thorough, the clearance of salinity is up to more than 99%, organism is then be separated in the mode of gaseous state, produces carbonic acid gas and water and is disposed to atmospheric environment after treatment, meet emission request after burning; Meanwhile, lower to equipment requirements, simplify waste water treatment process, improve stability and the continuity of waste water treatment process; In addition, the heat in the flue gas that secondary combustion produces is that preheating is carried out in particle calcining, greatly reducing the fuel consumption in calcination process, effectively reduces production cost.
Accompanying drawing explanation
Fig. 1 is the schema of the inventive method.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the present invention is described further:
See Fig. 1, the treatment process of high density high-salt wastewater of the present invention, comprises the steps:
Steps A, pending high density high-salt wastewater is sent to filtration unit carries out preliminary filtration, remove the suspended substance in waste water, in this step, porous masses can be selected to filter, certainly, other filtration unit can be selected, according to techniques well known general knowledge, as long as the filtration unit selected can remove the suspended substance in waste water.
Step B, be sent to pH regulator system by through the preliminary waste water filtered, according to the pH value of waste water, in waste water, add acid and/or alkali, the pH value of waste water is adjusted within the scope of 6.0-7.0, preferably the pH value of waste water can be adjusted to 6.5, make waste water be slightly acidic.
Step C, the waste water after adjusted to ph is sent to MVR vaporizer, carries out evaporation concentration to waste water, improve the salt in waste water and organic concentration, in this step, selected vaporizer is not limited only to above-mentioned MVR vaporizer; In actual production, the mass percentage concentration of salt in waste water can be brought up to more than 20%, COD concentration brings up to more than 100000mg/L, that is, when guaranteeing that in waste water, salinity and organism are not separated out, increase salinity and organic concentration as far as possible, be convenient to follow-up step can carry out preferably, improve the efficiency of wastewater treatment as much as possible; Certainly, for the waste water of different component, appropriate selection can concentrate rear salinity and organic concentration, that is, concentrated result is not limited in above-mentioned scope, can select according to practical condition.
Simultaneously, it is further noted that, in this step C, the water of condensation concentrating generation due to condensation may have harmful substances, water of condensation can be sent to biochemical treatment system successively, advanced treatment system processes, discharge after meeting emission request or supply production plant reuse, advanced treatment system can be select the modes such as Fenton process, oxidation pond, membrane processing method.
Step D, the waste water after concentrated is sent to granulating equipment, and adds clay, waste water is combined with clay and makes particle.
Step e, the particle made by step D are sent into kiln and are calcined, and the temperature of calcining is not less than 700 DEG C, make the salinity in particle and the dehydration of other inorganicss form slag, carry out landfill disposal after being discharged by slag from kiln; In calcination process, the organism in particle and the calcining of other compositions produce gas; In this step, calciner is not limited to adopt kiln, and calcining temperature is not limited only to above-mentioned scope, according to the condition of production of reality, calcining temperature can be selected at 500 DEG C, 600 DEG C or 750 DEG C, the salinity in particle and inorganics dehydration formation slag will be guaranteed in a word.
Step F, the gas that step e calcining produces is sent to dual firing chamber and carries out secondary combustion, the flue gas that burning produces is through off gas treatment, atmospheric environment is disposed to after up to standard, off gas treatment mode herein can be identical with existing off gas treatment mode, can be specifically the processing mode such as denitrification, dust removal process; In the process of secondary combustion, in order to avoid producing the hazardous and noxious substances such as Dioxins, the temperature of secondary combustion can be controlled within the scope of 900 ~ 1100 DEG C, can be preferably 1000 DEG C.
Because the flue gas produced after above-mentioned secondary combustion has higher temperature, therefore, the present invention can be that the flue gas above-mentioned secondary combustion produced was sent to heat exchanger before carrying out off gas treatment, flue gas with the refrigerant heat exchange of heat exchanger after the heat that produces can be used for the particle before calcining in step e and and the air of particle burning carry out preheating, so, reducing heat loss, improving on the basis of heat utilization rate, save energy, effectively can improve the efficiency of particle calcining, effectively avoid occurring that particle is not occurred by the situation of after-flame.
It is pointed out that in step D, can be not only select clay to mix particle processed as inert material with waste water, it can also select the inert material such as kaolin, diatomite to prepare particle.
Here it should be noted that, realize aforesaid method of the present invention, be not limited in the above-mentioned concrete equipment mentioned, according to the concrete operation step that aforesaid method of the present invention is pointed out, those skilled in the art can select corresponding equipment certainly accordingly.
In aforesaid method of the present invention, the operations such as particle, calcining, secondary combustion are prepared owing to adopting, can by the salinity in waste water with solid-state isolated in form out, and be separated comparatively thorough, the clearance of salinity is up to more than 99%, organism is then be separated in the mode of gaseous state, produces carbonic acid gas and water and is disposed to atmospheric environment after treatment, meet emission request after burning; Meanwhile, lower to equipment requirements, simplify waste water treatment process, improve stability and the continuity of waste water treatment process; In addition, the heat in the flue gas that secondary combustion produces is that preheating is carried out in particle calcining, greatly reducing the fuel consumption in calcination process, effectively reduces production cost.
To one skilled in the art, according to technical scheme described above and design, other various corresponding change and deformation can be made, and all these change and deformation all should belong within the protection domain of the claims in the present invention.
Claims (7)
1. a treatment process for high density high-salt wastewater, is characterized in that, comprises the following steps of sequentially carrying out:
Steps A, utilize filtration unit to filter high density high-salt wastewater, remove the suspended substance in waste water;
Step B, in filtered waste water, add acid and/or alkali, the pH value of waste water is adjusted to 6.0-7.0;
Step C, evaporation concentration is carried out to the waste water that have adjusted pH value, improve salt and organic concentration in waste water;
Add inert material in step D, waste water after concentration, waste water is combined with clay and makes particle;
Step e, the particle that step D makes to be calcined, make the salinity in particle and the dehydration of other inorganicss form slag, landfill is carried out to slag;
Step F, to step e calcining produce gas carry out secondary combustion, secondary combustion produce flue gas carry out off gas treatment after be disposed to atmospheric environment.
2. the treatment process of high density high-salt wastewater as claimed in claim 1, is characterized in that, in step C, the mass percentage concentration of salt in waste water is brought up to more than 20%, COD concentration brings up to more than 100000mg/L.
3. the treatment process of high density high-salt wastewater as claimed in claim 1, is characterized in that, in step e, particle is sent into kiln calcining, calcining temperature is not less than 700 DEG C.
4. the treatment process of high density high-salt wastewater as claimed in claim 1, is characterized in that, in step F, gas step e produced sends into dual firing chamber's burning, and the temperature of combustion of dual firing chamber controls within the scope of 900 ~ 1100 DEG C.
5. the treatment process of high density high-salt wastewater as claimed in claim 1, it is characterized in that, in step F, the flue gas that secondary combustion produces was sent to heat exchanger before carrying out off gas treatment, flue gas with the refrigerant heat exchange of heat exchanger after the heat that produces for the particle before calcining in step e and and the air of particle burning carry out preheating.
6. the treatment process of high density high-salt wastewater as claimed in claim 1, is characterized in that, the water of condensation concentrating generation in step C also needs to carry out biochemical treatment system successively, advanced treatment system carries out processing rear discharge or reuse.
7. the treatment process of high density high-salt wastewater as claimed in claim 1, is characterized in that, inert material is clay or kaolin or diatomite.
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Application publication date: 20151223 |